发明名称 |
Retractable bit guide for a drilling and bolting slide |
摘要 |
The body of a bit guide assembly is mounted on a base which pivots on a frame about a first pivot point and may thus be retracted in order to allow the passage of the anchoring bolt screwed after drilling a hole. A double-acting jack has its rod pivoted on the base, whereas its body is pivoted on a dog, in turn mounted to pivot on the frame about a second pivot opposite the pivot point. The dog comprises a locking tooth which cooperates with the end of the base remote from the first pivot point. The free end of the dog cooperates with a retaining tooth formed on a connecting-rod, mounted to pivot about a fixed pin and biased by a spring against a stop. The same jack thus controls the retraction of the bit guide, for bolting and its locking in the lowered position, for drilling.
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申请公布号 |
US4472002(A) |
申请公布日期 |
1984.09.18 |
申请号 |
US19830463004 |
申请日期 |
1983.02.01 |
申请人 |
EIMCO-SECOMA SOCIETE ANONYME |
发明人 |
BENEY, GILBERT;COMBET, MICHEL |
分类号 |
E21B19/24;E21B7/02;E21B19/084;E21D20/00;E21D21/00;(IPC1-7):F16C1/26;E21C9/00 |
主分类号 |
E21B19/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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